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There are several members that built up their transom. You would have to look in the Personal Pages at all the 1970 13 models and below.
http://www.whalercentral.com/viewpage...page_id=65

Here is an example of a member that removed all the wood in the transom and replaced it on an Outrage 18' which would be the same principle.
http://www.whalercentral.com/userphot...album_id=8

Here is one members 13' that has an inexpensive elevator type bracket.
http://www.whalercentral.com/infusion...er_id=4603

Here is just one example of the elevator bracket
http://www.iboats.com/Transom-Elevato...w_id.40157

Trying to put a 20 inch shaft on a 15 inch transom would be like throwing your anchor overboard and then trying to get the boat up on plane.